I have a Core 2 Duo 2.33Ghz PC which i have just installed a BluRay drive and a Sapphire ATI Radeon HD3450 graphics card. When trying a BluRay disk or a BluRay rip through the provided Cyberlink PowerDVD software, the picture is very jerky at times. I can watch the BluRay rip (but not the BluRay disk) through VLC player with no jerkiness at all. Has anybody any ideas about this or can anyone recommend a good software player. I am in the middle of downloading Arcsoft TotalMedia Theatre to try that but any advice appreciated.